Transfer Path Analysis And Test Of Vibration Of Space Science Load

In the aerospace field,there are countless mechanical systems that contain active devices.At the same time,due to the complexity of the mission and the harsh mechanical environment,the vibration of space vehicles has increasingly aroused the interest of engineers,and various analysis methods have been applied to them.As a relatively new method of transmission path analysis,many engineers have carried out related research work.However,the existing analysis methods based on the transfer path mostly use displacement,velocity,and acceleration as the response of the output point.In view of the difficulty of measuring the force,few analysis methods about the force transfer path are applied in practical research.Since the input of force directly affects the vibration response of the system,it is more valuable to analyze the reaction force between mechanical systems.This paper takes the space scientific payload of a certain satellite as the research object.Based on the existing traditional transmission path analysis method,a simulation-based analysis method of the support reaction force transmission path is proposed.This method is used to calculate the different working conditions.Output point reaction force data,and analyze the contribution of the reaction force path to the space scientific load.First,according to the difference in accuracy,the traditional transfer path analysis method is selected as the theoretical basis of this article.Through the theoretical research,the method of obtaining excitation force and structure transfer function is clarified,and on this basis,a method based on modal superposition is proposed.The simulation analysis method of the supporting reaction force transmission path.Secondly,an analysis model of the supporting reaction force transmission path containing 144 paths of spatial scientific loads is established,the supporting reaction force structure transfer function is calculated through finite element modeling and modal analysis,and the actual load excitation is measured by the direct method.The supporting reaction force transmission path analysis method calculates the output point reaction force data under different working conditions,and analyzes the working conditions when the excitation source is running at the same time,to obtain the main supporting reaction force transmission paths,and carry out the reaction force on these paths Path contribution analysis,and finally get the root cause of the excessive contribution of the main path reaction force.Finally,by setting up a test platform to simulate a non-gravity environment in space,the output data of the support reaction of space scientific loads under different working conditions are collected,and the obtained test data is compared with the simulation analysis data to verify the support reaction proposed in this article.The correctness of the transfer path analysis method and the analysis of the contribution of the reaction force transfer path based on simulation.